Improvement in sewing-machines



INITED STATES PATENT ()FFIGE.

JOHN MGCLOSKEY, OF NEW YORK, N; Y., ASSIGNOR TO HIMSELF AND SAML. B. BALLOU, OF SAME PLACE. l

4 lMPROVEMENT IN SEWING-MACHINES.

Specification forming part (if-Letters Patent No. 48,345, dated June 20, 1865.

To all whom it may concern:

Be it known that 1, JOHN MoOLosKEY, of city, county, and State of New York, have invented a new and useful Improvementin Sewing-Machines; and I do herebydeclarc that the following is a full, clear,and exact description of the same, reference being bad to the accompanying drawings, forming part of this specification.

This invention consists in a novel device by the placing of which in proper relation to the rotating hook and the bobbin of what is known as the Wheeler and Wilson sewing-machine (without any alteration of the parts of themachine from the usual construction) the enchaining of the loops of the needle-threadis etteeted, and when a thread is used in the bobbin a locked chain-stitch isproduced,or by the omission of thread from the bobbin a simple chain or tambour stitch is produced by the machine.

Figure l is a side view of the thread-enchaining device in the form which'I prefer, detached from the machine. Fig. 2 is a vertical axial section of the bobbin and a backview of the thread-enchaining device. Fig. 3 is a side view of the needle, the rotating; hook, and bobbin,

with the thread-enchainin g device in place, showing, also, a part of the cloth-plate in section. Fig. 4 is a top view of the rotating hook,

' the bobbin, and the thread-enchaining device,

, sponding parts in the several figures.

The thread-enchaining device consists of a flat hook, A, made of a thin piece of sheet metal, having firmly secured to it a pivot, a, which fits easily into the eye of the bobbin B. This pivot 00 is made with a shoulder, 12, of such thickness that when the said pivot is inserted into the eye of the bobbin from the back orin ner side, and the bobbin inserted into the central cavity in the face of the rotating hook O, the said hook A may enter the groove 0, provided in the hook for the entrance of the needle d, and the outer surface of the said hook A may be behind the line of movement of the needle, so that the needle may pass between the said hook A and the tongue or nose 0 of the rotating hook, as shown in Figs. 4 and 5. The said hook is made with a blunt point, 9, which is set in the reverse direction to the point of the rotating hook, and for some distance back from this point itis made of the form of an arc, the external profile of which has aradius nearly corresponding with that of the externalcircular profile ofthe rotating hook (J. The back of the said hook is rounded off, as shown at fin Figs. 1, 3, and 6, and the length from the point g to the back f is such that when the point g is in contactwith the back of the throat h of the rotating hook the back f is opposite to the heel t of the rotating hook. In the example of the hook A (shown in Figs. 1, 2, 4, and

5) a thin metal disk,j, conforming to the exterior of the bobbin B, is attached to the pivot a; but in the example shown in Fig. 6 this disk is dispensed with, and I may here remark as far as I have experimented l have found that the hook A works equally well with or without the said disk.

In the application of my thread-enchaining together in the central cavity of the rotating hook C, the point of the hook A being slipped through the groove 0 and behind the nose of the rotating hook, and the hook Aandibobbin are secured in place by means of the wellknown bobbin-ring in the same manner as the bobbin is ordinarily secured.

When the machine is set in operation the friction between the rotating hook, the bobbin, and the shoulder a or disk j of the rotating hook, as the case may be, causes the point 1 of the hook A to remain in contact with the back of the throat h of the rotating hook O, and causes the book A to rotate with the book 0.

In the operation of the machine the loops of the needle-thread are extended by the rotating hook (J in the same manner as in the Wheeler and Wilson machine without theenchainingdevice or hook A but. as that side of theloop (marked "1 in Figs. :4 and 5,) which passes-over the inner side'or back of the bobbin escapes past the heel of the rotating hook and the bend of the loop escapes from the brush it, pad, or other loop-check, the said side lot the loop, in-

stead of being drawnupward on the outer side way the loops are enchained together on theunder sideof the cloth, as shown in red color in Fig. 7.

When a locking-thread is used in thebobbin B the said thread (shown in blne-color i-n Figs. 3, 5, and 7) passes through each'ot' the loopsof the needle-thread in the same manner as it does when the book A is not used, and forms,

when using said hook, thelocked chain-stitch represented in Fig. 7. If the thread be omitted from the bobbin, the enchaining of the loops of the needle-thread produces a chain or ta-mbour stitch. v

It will thus be understood that the simple application of the hook A to the Wheeler and Wilson machine enables that machine to produce two other stitches differing from each other and from the lock-stitch produced by the said machine without the book A, each loop of either of the stitches thus formed by my improvement having the threads once crossed, as shown on the drawing, Fig. 7.

I am aware of the invention of Boecke, English Patent No. 3,190 of1'860. This I disclaim; but

What I claim as my invention, and desire to secure by Letters Patent, is-

Thehook A, constructed and applied to operate substantially as herein describedyin combination with'the rotating book 0, bobbin B, and needle, t'or'the purpose herein set forth.

JOHN MOGLOSKEY.

Witnesses J. W. COOMBS, GEo. W. REED, 0. RICE. 

